A software company is interested in improving customer satisfaction rate from the 80% ourrently claimed. The company sponsored a survey of 160 customers and found that 135 customers were satisfied What is the test statistic 2? Ex: 1.23:

Q: ii, 20 coins are flipped each with a probability of 0.5 that it will be heads. What is the standard…

A: Given,n=20p=0.5q=1-pq=1-0.5=0.5

Q: In this table, x represents the number of years that have passed since 1975. For example, an x-value…

A: The independent variable is x. The dependent variable is y. We have to predict the profit in the…

Q: Previously, 13.6% of workers had a travel time to work of more than 60 minutes. An urban economist…

A: Solution-: Given: P0=0.136,x=12,n=70,α=0.1 (a) We want identify the hypothesis? (b) Test hypothesis…

Q: 5. In a group of 40 people, 35% have never been abroad. Two people are selected at random without…

A: Let X represents the number of people have been abroad.  Given that,  35% have never been abroad q=…

Q: Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at…

A: Required probability is P(N and W)

Q: se variables is strong and linear.  If a regression equation is constructed in order to predict…

A: Since it is given that the Systolic and diastolic blood pressure are measured in a large sample of…

Q: 3. A researcher claims that the performance of graduates of Training Program 1 differ from the…

A: There are two independent samples which are training program 1 and training program 2. We have to…

Q: Activity: Sketch and Locate Locating test statistic: (a) Draw the normal curve. (b) Locate the given…

A: Each hypothesis has two tail, they are one tail and two tail. Every normal curve has two region,…

Q: In a sample of 300 college seniors, 240 responded positively when asked if they have spring fever.…

A:

Q: List the sample space.                           ["", ""]            Let A be the event that there…

A: here given an experiment consists of tossing nickel , dime and quarter  that is total 3 coins are…

Q: A sociologist plans to conduct a survey to estimate the percentage of healthcare professionals who…

A: From the provided information, Confidence level = 92% Margin of error = 3%

Q: Test the hypothesis using the P-value approach. Be sure to verify the requirements of the test. Ho:…

A:

Q: A new machine has just been installed to produce printed circult boards. One of the critical…

A:

Q: 5. The average cell phone lifespan, according to a new research, is 24.3 months. It takes 2.6 months…

A:

Q: c. Age of first heart attack - The horizontal axis is age. The vertical axis is frequency (number of…

A: We want to tell you which one is the correct choice

Q: Given the following data: 43 50 47 49 56 Determine MAD a) Σ -mean %3D b.) MAD = (in one decimal…

A:

Q: discharge of suspended solids from a phosphate mine is normally distributed, with  a mean daily…

A:

Q: data items is normally distributed with a mean of 900and a standard deviation of 30. Find the data…

A: Given that  Z=2.5 , μ = 900 , σ = 30

Q: Critical values for quick reference during this activity. Confidence level Critical value 0.90 2* -…

A: Given that  X=190 , n=1000

Q: Which one of the following statements is true?   When predicting one quantitative variable based…

A: When predicting one quantitative variable based on another, the variable you are trying to predict…

Q: A random sample of 250 bolts from machine A contained 25 defective bolts, while an independently…

A: GivenFor Machine Asample size(n1)=250x1=25p1^=x1n1=25250=0.10For Machine Bsample…

Q: Determine the point estimate of the population mean and margin of error for the confidence interval.…

A: Given that, Lower bound = 19 Upper bound = 31

Q: Assume the sample is representative of the entire population. For a person selected at random,…

A: Given that  New diagnostic test for the condition are shown.   Condition ispresent Condition is…

Q: why is the median unaffected  by extreme values occurring in only one tail oif the distribution(in a…

A: We have given statement about the Median.  Median: It is the middle most value of the data set that…

Q: The drug Tamiflu (oseltamivir phosphate) is used to attack the influenza virus to reduce symptoms…

A:

Q: ng the number of enre ay Tuesday Wednes 10 20

A: The explanation is given as,

Q: Statistics: Solve the following statistical problems using correlation. 1. The final test and exam…

A: a) Regression Equation: Excel Procedure: Enter statistics and OR in Excel>Data>Data…

Q: C. Find the mean x. 1. 4, 6, 8, 9, 13 2. 8, 6, 7, 9, 5, 5, 9 3. 2, 5, 4, 8, 6 4. 4, 6, 8, 9, 10, 7,…

A: Given: 1. 4,6,8,9,13 2. 8,6,7,9,5,5,9 3. 2,5,4,8,6 4. 4,6,8,9,10,7,5 We need to calculate the mean…

Q: According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft,…

A:

Q: (i) (ii) (iii) Construct a histogram Construct a polygon Compute the mean, mode, median and standard…

A: i) Histogram: ii) Frequency polygon:

Q: . Which of the following statements belong/s to the area of inferential statistics? a. An economist…

A: Given that  Which of the following statements belong/s to the area of inferential statistics? a. An…

Q: A data set about speed dating includes​ "like" ratings of male dates made by the female dates. The…

A:

Q: Consider the hypotheses shown below. Given that x = 59, o = 11, n= 31, a = 0.10, complete parts a…

A:

Q: Question 16: If n=30, ¯xx¯(x-bar)=35, and s=20, construct a confidence interval at a 99% confidence…

A:

Q: A sociologist claims that the students’ college GPA’s in unrelated to their families’ incomes. For a…

A: It is given that Sample size n = 20 Correlation coefficient r = 0.40 Level of significance = 0.01

Q: 45. A researcher measures IQ and weight for a group of college students. Which kind of correlation…

A: We have given the following statement about the correlation.

Q: Systolic and diastolic blood pressure are measured in a large sample of healthy adults. The…

A: Disclaimer: Since you have asked multiple questions, we will solve the first question for you. If…

Q: Answer the following questions about probability and statistics. A. What is P(X = 5) when X ~…

A: Given that.   X~N( 5 ,25 )     X~N( 0 , 1 )   μ=0  , ?=1 (for standard normal distribution)…

Q: 3. The following are the lengths of bolts, in centimeters, produced by a machine: 19.63 20.80 19.54…

A: Confidence interval are used to measure the range where the parameter exist. It is calculated by the…

Q: Express the confidence interval (12.2 % , 30.2 % ) in the form of p ± E.

A: Given that  Confidence interval (12.2% , 30.2%) Lower limit =12.2%=0.122 Upper limit =30.2%=0.302

Q: For each of the scenarios given below, choose the most appropriate method for analyzing the data.…

A: From the provided information, Sample size (n) = 216

Q: 1.3. Do the data suggest that the two methods provide the same mean shear strength? Use α = 0.1.…

A: P value is grater than the level of significance  We fail to reject the null hypothesis There is no…

Q: 4. The capacitance of capacitors produced by a machine is approximately normally distributed with a…

A:

Q: 1) what is the sampling method in this senario? Employees of a certain factory are grouped according…

A: Given that, Employees of a certain factory are grouped according to gender. An equal number of…

Q: Within the nexXt two years. An inexpensive suppressor, which would provide protection for only one…

A: here given, The owner of a small firm has just purchased a personal computer, which she expects will…

Q: According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft,…

A:

Q: A simple random sample of size n = 16 is drawn from a population that is normally distributed. The…

A: Given data : sample size, n =16 sample mean, x̄ = 21.2 sample standard deviation,s= 6.5…

Q: 2. A student assistant administers an exam for the incoming grade 11 ABM students. Fifteen incoming…

A:

Q: According to a report, the standard deviation of monthly cell phone bills was $5.23 three years ago.…

A: Given that  A report the standard deviation of monthly cell phone bills was $5.23 σ=$5.23

Q: Calculate the probability (as a percent) of the following 7-card hand: AAABBCC (three cards of the…

A: Let us suppose there are three marbles viz. a red, a green and a blue. From these, there are three…